(Uganda Christian University, 2025-12-14) Ainebyona Shadrach Ahumuza
This research aimed to evaluate the effectiveness of integrating hydrated lime (HL) as an additive to enhance workability properties of granite stone dust (GSD)modified asphalt mixes, due to the particle angularity and roughness of GSD and its inability to effectively interact with the binder. The study utilized hydrated lime to substitute GSD at 0%, 1%, 2%, 3%, and 4% by weight of aggregates. A series of laboratory tests—Marshall Stability, Marshall Flow, Bulk density, Air voids, Indirect Tensile Strength (ITS)—were used to evaluate workability properties. Notably, the 3% hydrated lime demonstrated the best performance, denoted by the maximum Marshall Stability of 16.7 kN, best Flow of 3.6 mm, maximum Bulk density of 2.344 g/cm³, and best moisture resistance with a TSR of 96%. It is evident that the use of 3% hydrated lime improves the workability of GSD asphalt for low-volume road constructions in tropical environments such as Uganda.